Manuel Kauers, Philipp Nuspl, Veronika Pillwein,
"Order bounds for $C^2$-finite sequences"
, Serie RISC Report Series, Johannes Kepler University Linz, Austria, Nummer 23-03, RISC, JKU, Hagenberg, Linz, 2-2023, ISSN: 2791-4267
Order bounds for $C^2$-finite sequences
Sprache des Titels:
A sequence is called $C$-finite if it satisfies a linear recurrence with constant coefficients. We study sequences which satisfy a linear recurrence with $C$-finite coefficients. Recently, it was shown that such $C^2$-finite sequences satisfy similar closure properties as $C$-finite sequences. In particular, they form a difference ring. In this paper we present new techniques for performing these closure properties of $C^2$-finite sequences. These methods also allow us to derive order bounds which were not known before. Additionally, they provide more insight in the effectiveness of these computations. The results are based on the exponent lattice of algebraic numbers. We present an iterative algorithm which can be used to compute bases of such lattices.
Sprache der Kurzfassung:
RISC Report Series, Johannes Kepler University Linz, Austria